Leyline of Transformation 
Enchantment
$0.52 #3544 0.27 1.9 years
If this card is in your opening hand, you may begin the game with it on the battlefield.
As this enchantment enters, choose a creature type.
Creatures you control are the chosen type in addition to their other types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield.
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Cards similar to Leyline of Transformation expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Arcane Adaptation98%
$3.05↑#39900.258.9 years↑
"Creatures you control are the chosen type in addition to their other types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
+1 more matching line
Conspiracy98%
$0.39↓#5345↓0.41↑26.9 years↑
"Creatures you control are the chosen type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
+1 more matching line
Maskwood Nexus92%
$1.47↑#490↑0.375.6 years↑
"Creatures you control are every creature type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
Rukarumel, Biologist87%
$1.98↑#10665↓0.333.1 years↑
"Slivers you control and nontoken creatures you control are the chosen type in addition to their other creature types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
+1 more matching line
Biotransference86%
$9.61↑#4258↓0.43↑3.9 years↑
"Creatures you control are artifacts in addition to their other types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
Xenograft86%
$0.94↑#14289↓0.40↑15.3 years↑
"Each creature you control is the chosen type in addition to its other types."
+1 more matching line
Leyline of Singularity85%
$4.74↑#14126↓0.3620.6 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Roshan, Hidden Magister82%
$0.23↓#6880↓0.09↓2.2 years
"Other creatures you control are Assassins in addition to their other types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
Leyline of the Guildpact80%
$3.41↑#1738↑0.45↑2.6 years
"If this card is in your opening hand, you may begin the game with it on the battlefield."
+1 more matching line
Ashes of the Fallen78%
$7.77↑#13909↓0.2521.3 years↑
"Each creature card in your graveyard has the chosen creature type in addition to its other types."
+1 more matching line
Leyline of Anticipation78%
$3.40↑#735↑0.56↑16.1 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of the Void78%
$0.39↓#34540.92↑20.6 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Combustion78%
$0.59↑#10587↓0.287.2 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Lifeforce76%
$6.06↑#13118↓0.40↑20.6 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Sanctity76%
$0.28↓#7484↓0.3716.1 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Mistform Wakecaster74%
$0.11↓#30150↓0.00↓23.6 years↑
", 
: Choose a creature type. Each creature you control becomes that type until end of turn."
, : Choose a creature type. Each creature you control becomes that type until end of turn."+1 more matching line
Leyline of Vitality74%
$3.31↑#11240↓0.2516.1 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
+1 more matching line
Leyline of the Meek73%
$1.59↑#17299↓0.2921.0 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Punishment73%
$3.33↑#10480↓0.50↑16.1 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Hivestone70%
$0.47↓#16828↓0.59↑19.9 years↑
"Creatures you control are Slivers in addition to their other creature types."